Disk-grinding machine.



W. A. LORENZ.

DISK GRINDING MACHINE.

APPLICATION FILED JUNE 13. 1911.

Patented Ja11.14, 1919.

lYYlYlY/I Inventor M%% Witness sv i/alrvz'sv STATES. PATENT onnicn.

'WILLIAM A. LORENZ, OF HARTFORD, CONNECTICUT.

DISK-GRINDING MACHINE.

To all whom it may concern:

Be it hown that 1, WILLIAM A. Loannz, a citizen of United States, residing at Hartford, in the county of Hartford and State .3 of Connecticut, have invented new and use- Ordinarily the a rasive disks are glued tothemetal din disks. This has'to be done nemainflat. Italso consumes considerable time in attaching and When a new disk is attached the old one must be removed, and the metal disks must be cleaned before attaching a new "abrasive disk.

My. invention comprises the combination.

of a perforated disk, means to rotate it, and means of exhausting air from the interior of the disk, for the purpose of holding the abrasive disk, on the outer face of the grindin disk. a 3

. igure 1 shows a side view, partly in section, of disk grinding machine.

Fig. 2 shows partial front view of same.

Fig. 3 shows a modification of the invention.

5 shows an-upright to which is secured a head 6, having suitable bearin for supporting the spindle 7 of the mac inc. 8 is the drlvingpulley for the spindle. 9 is a stud upon which an oscillatin arm 10 is supported. This arm is rovi ed with a suitable counterweight, an its other end supports a fixture for holding the work 11 to .be ground. a

Upon the end of the spindle 7 is placed .the rotating disk 15, whic has a front face 16, provided with a series of holes communiwith the hollow interior 17 of the The spindle 7 is made hollow as at 18, and at the rear end of this spindle a pipe 19 is inserted, suitable packing 20 is employed in order to make an air-t1ght joint between the pipe 19 and the hole 18.

The pipe 19 is connected to piping as shown, the other end of which is connect tofan exhaust reservoir 24,- which may be exhausted by suitable exhaust pump through 56 the pipe 25. A globe valve 26 may be em-- Specification of Letters Patent.

' Application filed June is, 1917. Serial no. 1741506.

erthatthesurfacewill Y lows:

' lIlOS Patented Jan. 14., 1919.

ployed in the piping for closing the connection between the machine and the exhaust reservoir 24.

The holes 30, 31, 32, 33, etc., may be of any form desiredand of any size desired. I prefer, however, to arrange them alter= nately as shown-in the drawings.

In order to tie the outer face 16 of the disk to the narrow surface, I employ a series of connecting pieces 35, which are cast in the disk. Around the disk 15 is placed a guard 36 projecting beyond the disk 16, so as to hold the latter, in case the vacuum is accidentally lost.

The operation of machine is as'fol-.

order to attach the abrasive disk to the g1'111(l 1l1g disk, the machine is stopped and the disk, as'a't 40, is placed against the face of thedis'r. The pump is then started, air is exhausted from the reservoir through the piping and from the interior 17 and through ho es in the disk. This will cause the disk to adhere firmly to the disk itself, even when rotating at hi h speed, The vacuum may be mamtaine continuously through the grinding operation.

The piece to be ground, as at 11, may be placed on the rocking arm and rocked forgailid against the surface. of the abrasive To removethe abrasive disk all that is necessa is to stop the machine and the ateric pressure, when the disk can readily e taken away and another one can quickly be attached.

I prefer to make the holes in the disk of sufiicient size, so that during the exhaust operation the abrasive sheet will sink slightly into the holes as shown at 42. These sunken surfaces then will not cut, but will make ockets' for the accumulation of dust durthese recesses have assed the articles t6 be ground, permit the ust to fly off.

When the disk has been worn out in one position, then it may be shifted slightly so that those portions which were '0 posite the holes will be supported by the at surface of the disk between the holes. Consequently the abrasive disk may be used again. These 'mg the grinding operation, which, after ed portions previously placed opposite the v A modification of this device is shown in Fig. 3, in whch the outer disk 45 is bolted to the carrying disk 46, the abrasive being the frame 51 of the machine.

shown at 47. This permits the disk to be turned all over to balance it.

The means for exhausting the air from the disk is modified as follows The hub 48 of the disk is turned down and surrounded by a, bracket 49 secured at 50 to One or more holes 52 are bored from the interior of the disk through to the annular recess 53, which communicates with the annular recess 54, around the bracket 49 with the pipe 55, connecting the recess 54 withthe vacuum pump.

The operation of the machine is similar to that heretotore described, the air being 1. In a disk grinding machine the combination of a perforated disk; means to rotate the disk and means for exhausting the air from the interior of the disk, for the purpose of holding an abrasive disk on the outer surface of the grinding disk.

2. In a disk grinding machine the combination of a perforated disk, said disk being provided with a series of holes which are staggered; means for exhausting theair from the interior of the disk for the purpose of holding an abrasive disk on the outer surface of the grinding disk.

WILLIAM A. LORENZ. 

